Constant-volume valve



M. J. DEWEY. CONSTANT VOLUME VALVE. I APPLICATON FILED IUNEB, 1920. c 1,407,844, Patnted-Feb. 28, 1922.

"starrt, iio'w of the fluid MAURicE J. DEWEY,

E HOUSTON, TEXAS,

CON STAN 'JJ-VOLUME VALVE.

K `Application filed June 8,

" use the 'samel invention jrelates'to-an improvement in constant volume valvesufor usein regulating the flower atluid through a passage.

vIt is?frepiently4 desirable in supplying fiuidssuch aszwatenoil, gas, steam, etc., for consumption that' somey means be; provided to assurea constant, oriapproximately conto the consumer, through any" particular conducting pipe.v It

'is vappa'rei'itjthat if the known rate or flow is constant and the area of the oriice be known,

they/amount supplied during a given time may beI found within approximate accuracy.

'The" object'or my invention isto provide anautomatic valvebfy'y means of which a constantflow ofil'uid through; a passage may be haetrega'rdles'sv ofthepressure of the liui'd at theinlet orthe back pressure at the outlet.

VAnother object is to provide'a'valve of the nature" described iwhich will Vregulate a constant'ilow of al iuid therethrough regardless of yvariatioiisin pressure at both outlet and inlet'man'd which, in caseof gases, will be unaffected by variations of pressure at the voutlet* aidin which'the flowy will be constant where' the pressure at the inlet is approximately constant.`

Other objects and advantages will more iowswY ,l c,

Referri 1gto the drawiijfg` wherein the prefriedembodiment" 'of my invention is disclearly appear inthe specification which tolclolsed, thelfigurelshows' a pla-n view of v'a system ofrpipes employing my. invention, the valve chamber of which is' in 'central longaudimi Sectie-n,

yo 'iiposite end .ofthe coupling 4 is threaded iiiteriorlylfor'attachment to aineiiiber 17 Specification of Letters Patent.

, having at the Patented Feb;l 28, 1922. 1920; seriaiivo. `587,341.

ent-rance thereto the valve chamber 6. The inlet T, 1, also has alaterally branchingV pipe 7 of comparatively small diameter leadingv by way of afvalve 8 to thel chamber 9 within the 10, to which said pipe is attached by being screwed into a plugr connection 11, which is inv turn exteriorly threaded .for attachment to said T10, This smaller pipe 7 formsa'bypassfrom the fin- 'let to the' chamber 9. The outer endo/ the coupling `10 is closed by' a plugorfnnt 12, similar in structuretot-hev plug 5,y previously'mentioned; Both these pl'ugso vand l2 are providedwith a central opening 21 threaded to receive a pin 19 i head 2O and projecting attheinnerendinto the .chamber withinth'e T. VThe saidn inner end has a cylindrical recess 18 counterboied therein tol serve as a guide, as will 'be' later explained.

The other end of the T 10 is threaded iiiteriorly to receive one endof thegtubula'r member 14, provi-ded with a charrib'erl 13 leading through the'valve "assage 15, tothe valve seat 22 in th'evalve 'cliamber 16; 4

The tubular .members 14and 17 l are' connected to theopposite endsfof a/coiiplingT 31, which has 'a lateral outletfpipe`23 leading to the place where'theuid is tobeiu's'ed.

As will be'seenin thedrawing, the Ts '4 'and 10 and the' connecting members 14,31`and17 yarein alignment.'z A valve rod 'is located lin inner ends of the` having' Sellem ameterfor a short distance andsaid reduced ends vlit loosely within the sockets 18.

The tubular member 17 has4- a 'centralfrestricted passage 25 formii'iggfavalve seat 26 Von the side thereof away from 't lie' 'cenV trail coupling 18; close vthe passage`25. ]t'is A cyl indricalV4 shape and tapered toI litupon thfe y Seat/ 26. ESaid valve is mounted upon'therod 24, u fon which it has athreaded"connectiemfan"` is heldiny position thereon by' a lock-nut 28.

At the other entrance' to theT' 3 1Jthe passage 15 of the memberl4isclosedbya valve 29 "similar in shapef tofvalve"`'2 7 and seated upon the valve" Seat* 22 'on' the". side iio of the passage 15 toward the coupling T 18. lt has a threaded connection on the rod 24; and locked in the desired position thereon by a lock nut 28. e

By means of this arrangement, it will be noted that the movement of the. rod 2l `in one direction will open both valves 29 and 27 While a movement of the rod in theopposite direction will force the valves into their seats and close the passages 15and 25.

Surrounding` the rod .Zl Withiuthe chamber 9` is a vhelical spring 30.' Said spring bears at its outer end upon a Washer 32 on theend of the pin 19 and encircling the reduced4 end of the rod Q4. The opposite end of the spring bears upon the face of the valve 29 and, the spring` being under compression, tends'to force the valves 29 and 27 from their seats with a constant pressure. The valve rod 24 is guided and limited in its longitudinal movement by the Walls of the sockets 18 into which it fits.

The operation of my device may now be readily understood. The 4 gate valve 8 is open. lfprivater or other similar liquid is forced through the inlet T 1, it Will have free passage through the pipes 2 and 7 to the valve controlled passages l'fand 15. The spring Wil] ordinarily tend to hold the valves from their seats and allouT a. flow Vof the, liquid through the outlet pipe 23. As the by-pass 7 is smaller than the pipe Qqthe pressure would tend at first, to be Vgreater in the chamber 6 than in the chamber 13. As

a result, the excess pressure in the `*cham-y ber 6 ,would tend to seat the valves against the tension of spring 30. Tf such action occurred the liquid would floiv through pipe 7 building up the Apressure in chamber 13 until itbecame nearly equal to that inthe chamber 6 and the spring 3() Wouldfthen open the valves and allow the liquid to flow past the valves as before. This equalization of pressure is almost instantaneousand the val vesI their' seats by approximately the amount of the Vpressure due to the action of the spring 30. This is not exactly true, however. due

to the drop of the pressure 'of the liquid in passing through the by-pass 7. The pressure would always tend to be greater in the chamber `6` than'in the chamber' `13, due to Y, this drop, the 4drop itself heilig caused in pipe '7 yby the smaller orifice thus `smaller pipe.

4 equalize itself, as `previously described, until produced .in ythe The pressure wouldtend to thespringivas allowed to unseat the valves,

andthen fthe adjustment would stop, the

liquid pressure e iny chamber 6 being still slightly in excess` of the fluid pressure in the chamber V13. Thereafter, `pressure occurred in the inloivving liquid in the inlet pipe it willv be apparent that the l device wouldimmediately accommodateit- 'selfvto the pressure change "andthe valves if variations of `volume passing through valve 8 through valve S 1s directly proportional to the total volume delivered at 23. t

lf gas, air, or steam were conducted through the device, however, the fact that they are compressible Would affect the :true `S0 volume, because of the change in density of gases as their pressure changes.k If., vhowever, the inlet pressure remains constantthe volume of gases passing through the valves 27 and 29 will remain constant, and the rate of floiv through them can be changed only by opening or closing. valve 8. Itis ap,- parent that variations in" back pressure at the outlet23 Will not affect the` rateA of charge asit would be exerted equally against valves 27 and 29 andthe resultant would be nil. This would be the sameboth. for liquids or gases. y My deviceis then-,notaifected by back pressure. or variations'therein, at the discharge orifice.4 This device, as shown and described, is understoodtto placed either longitudinally or with ,the inletend up. z Itis apparent that if the chainlticulai' construction described and shoWn 2r and 29 would normally be -held out of tion, a large inlety pipe adapted to conduct fluid against one of said valves so as tocausef it to close, a byepassleading to the opposite 120 face-of the other valve to assist in equalizing the fluid pressure, and a spring,` acting to normally force'said Vvalve Trod vand 'valves fromtheir seats. o i

2, ln a device of the character described,"1`25 tivo. connected valve chambers, an outlet 'between said chambers valves controlling :the passage of Vfluid'tlnougli said.y valveehambers, said valves being ,mounted on, asingle valve-rod, guides for said rod, an `inl'et ypipe 130 3. In a device of the character described,-

an inlet pipe, an outlet pipe, a constricted passage connecting said pipes, avalve therein adapted to close by the flow of fluid therethrough, a by-pass from said inlet to saidy outlet, a valve in said by-pass adapted to open by the flow of fluid therethrough, means connecting said valves for simultaneous operation and means tending to force said valves from their seats.

4. In a device of the character described, an inlet pipe, an outlet pipe, a connecting pipe between said inlet and outlet, a valve therein adapt-ed to close by the flow of fiuid from said inlet to said outlet, a by-pass from said inlet to said outlet, a valve in said bypass adapted to open bythe flow of fiuid to v said outlet, a rod connecting said valves,

and means tending to force said valves from their seats.

5. In a device of the character described, an inlet pipe, an outlet pipe, a passage from said inlet to said outlet, a valve in said passage, adapted to close by the flow of fluid to said outlet, a by-pass from said inlet to said outlet pipes, a valve therein opening toward said outlet, a rod connecting said valves and a spring on said rod tending to open said valves.

6. In a device of the character described, two valve chambers connected to a common outlet, a valve rod extending through said valve chambers, Valves on said rod in said valve chambers, an inlet pipe to one of said chambers, a by-pass to the second chamber, so arranged as to approximately equalize the pressure on both said valves and means on said rod to normally force said valves from their seats.

7. In a device of the character described, two connected chambers, an outlet between said chambers, a valve permitting Huid to pass from one of said chambers to said outlet, an inlet pipe adapted to conduct fluid under pressure into the other of said chambers tending to close said valve, a second pipe from said inlet t0 said first named chamber, and means tending to force said valve into open position.

In testimony whereof, I hereunto aix my signature this the 5th day of June, A. D.,

MAURICE J. DEWEY. 

